Derrick



Nov. 19, 1929.

Original Filed April 30 1925 A. SMITH DERRICK 2 Sheets-Sheet l 56 4. a95 65 L30 o; o i 8L9 ea o 30 6-7 0. //9 6 I J/ i 5144mm (WWW 204%51722272 N 1 1929. A. SMITH 1,736,419

DERRICK Original Filed April 30, 1925 2 Sheets-Sheet 2 IDIDDDDDDIDDD I n0 I I o I Q n 0 a 1 Patented Nov. 19, 1929 UNITED STATES PATENT OFFICEARVEY SMITH, or WINCHESTER, ILLINOIS, Assrcnon To KOEHRING COMPANY, orMILWAUKEE, WISCONSIN, ACORIPORATION or WISCONSIN DERRICK Applicationfiled April 30, 1925, Serial No. 27,095. Renewed. November 6, 1926.

My invention relates to improvements in derricks and has reference moreparticularly to those used on road pavers for the purpose of hoistingbatch boxes from donkey trains 5, and swinging such boxes to themachines.

A well known type of derrick for this purpose, embodies a mast which ismounted for vertical sliding and when free of load, is raised by springmeans, so that a swivel foot on its lower end is clear of the ground.Then, when the mast is under load, the foot descends onto the ground andforms a pivotal support for the mast so that the latter may be turned toswingthe load to the desired point. It it the primary object of myinvention to improve upon this type of derrick, by the provision ofco-acting means embodied with the mast and its foot, for automaticallyeffecting turning of the mast when it is under load, and in thisconnection, a further aim is to provide a foot which is sufiicientlyheavy to remain stationary upon the ground during at least part of theupward movement of the mast, effected by the spring means. Thus, 5'after the mast has lowered under load and has swung the load to thedesired point, freeing of the load and consequent raising of the mast bythe spring means, will effect reverse turning of said mast to again,position it at load-receiving position.

A still further object is to make novel provision to permit the foot ofthe mastto adapt.

itself to the ground, regardless of any irregularities in the latter,without danger of placthere is no danger of breaking such connectingmeans or causlng binding thereof.

Yet another object is to provide a unique. brake means whereby theturning movement ing any prying strain upon the connecting. meansbetween said foot and the mast,'so that In the drawings above brieflydescribed, the numeral 1 designates a portion of the common frame of aroad paver, said frame having upper and lower bearings 2 and 3 in whicha mast 4 is mounted slidably and rotatably. A conventional boom 5 isshown extending from the mast 4, connected at its upper end with thebearing 2,.by a chain 6, and provided with sheaves 7 over which ahoisting cable8passes. A portion of this cableis shown engaged with apulley block 9 for connectionwith a batch box 10 to be lifted, and otherportions of-said cable are shown strained around sheaves 11 and 12carried respectively by the mast 4 and the frame 1.

At 13, a coiled tension spring is shown, one end of said spring beingappropriately con nected with the frame 1, while its other end isconnected in the conventional or any desired way with the mast 4, sothat the spring exerts its power to raise the mast and associated partswhen free ofload. As soon as the derrick is connected with a loadhowever, and the cable 8 is operated, the mast 4 slides downwardlyagainstthe tension of the spring 13. I-Ieretofore, this downward slidingof the mast has brought a foot at its lowerend into contact withthe'earth. and after lifting of the load, this foot has constituted apivotal support for the mast so that it may be swung about a verticalaxis to move the load to the desired point. This moving is effectedmanually, by the use of one or more men pulling upon a rope, but due tothe nature of my invention, turning of the mast 4 and consequentswinging of the load to its destination is automatically carried out.This result may be obtained in numerous ways, one of which isillustrated, and described below.

At 14, a heavy metal foot is shown for the mast 4, said foot having arecess or bore 15 whose opposite sides are provided with helical 18 isconnected by" a flexible joint with the"= lower end of the mast 4, sothat the foot 14 may adapt itself to irregularities on the surface ofthe ground. In thepresent-showing,

the flexible joint comprises an car 19 rising from the member 18 andreceiving in a noteh- 20 in the lower end of the mast 4, a pivot pin 21being passed horizontally throngh said mast and car. This pin, I haveshown transverse to the axis of the rollers 17 to allzsw' pit otalmovement in ans di-retion, andit will be seen that said rollers willanew pivotal movement in a direction at right angles,

that in street a universalconn'e tion is previded between the'm'as'tand'the feat 14.

Preferably, the tracks or grooves lfi eir tend entirel to thetop 6f thefoot 14 and withdrawal of the toilets-or tlidlike l-Tfr-ol'n engagementwith said tracks; ispteveutect by acap ring-o1: the like 22whiclnhaywtll be se=- cured tathetop of the foot byst're'ws Above theheatin 3, I have shown a vet:- tically elongated, fiat-sided, sectionalhetly' 24secured-tothe mast any fasteners 25x- This body24 passesslidably through air opening" ina brake drum 26, establishing a drivingco nection between said drum and themast 4. A stationary brake bandQT'sur'r undstlle drum 26; and may welllie-confined between flanges 2 8onsaid drum ,sothat the latter is] held against ve'itioal'moveiheiit;The band Q/Z' may be stationarily held by any preferred means such asthe bracket arm: 29, and appropriate operating connections" 30 may be"provided for tlie'brake band-27', said conned tions preferably" having afootlever" 31- by means of'yvhich they ma be operated-to contracttheband27.

Ordinarily, thepa-rts' may be considered as standingsubs'tantially asshown in Fig. 1, ex

cept that the that 14and the l'nasti 4-" will be.

elevated to a slightlygr ater extenaby the spring 13, so that said footis clear of the ground; Whe new the-derrick reconnected to a load a ndthe cable 8 is Wound in the usual manner, the first movement whielitakesplace', is' downward sliding of the: mast 4 through the brake drum-26;until'the foot 1 4 rest's upon and adaptsitselfto the gteund. Duringthis" movement, the brake 27 has been heldflinclon matted positidn theoperator" will contime to 'lidld it in thistoutlitiouu-ntil the dew richo eratestoraise theload 10 to the-de sired point: Thus, during thisraising move meat, the mast 4 held against rotation When the loatl'hasheen-taised tothe desired extenthowever; thett-ake isat'ota'llypartially released, with the result that the load 10 slides' the mastsdewnwattlly withrespect' to the foot 14 which then rests stationarily onthe ground. This causes the rollers or the like 17 and the tracks 16, toeffect rotation of the mast 4, so that the load may be swunghorizontally to any desired point, Within an arc of substantially 180.As soon as the load is dumped,- the spring 13 exerts its force to raisethemast 4, but the foot 14 is sufliciently heavy tothen remainstationarily upon the ground, With-the result thattlieco-acting tracksand shoes 1617, act reversely from their previous action and thus swingthe mast 4 and associated parts to their original positions. the timethisrelation takesaplace, the shoes 17 have reached the upperextremities of the tracks 16 and the mast4 will then:- serve to elevatethe foot; 14 to ioint abovethe sur= face of the" ground under theinfluence of the spring" 13 It will be s'een froln the foregoing that Ihatspmvicled distinct and very advantageousil 'nprov'enients in deiricks of the-type embody'i-nga mast which is normally raised but isshifted downwardly under load: On ac= count o-fthe' excellent resultsobtainable from the details disclosed, they may of course be followed,but it'isto be understood that the: present disclosure isforillustrative purposes only and that within the scope of the inventionas claimed, numerous modifications may bemacle; v

VVheII there is=no1load on-the-mast, it is held its highest position bythe coil spring. When the'mast is thus held, the foot isolf the ground,and due to it s weight, it is atits lowe'stpositio'nlon the-mast asshown in Figure 1. The brake is now applied, and a load'hoisted, Theweight of the load causes the mast to movedownW-ardly until the: footispressed agai st the ground; The brake prevents turning of the mast, sothat any further downward movement of. the same must be aocolnp'anie'dbya turning of the'foot, due to the helicali cam tracks therein, and; theshoes carried by the mast. Turning of the foot is prohibited by itsfrictional and compressive engagement. with the ground caused by itsown- Weight and the weight of. the load on the mast. When the brake isreleased, the

mast isfree to turn in: the foot,and does sov under theweight oftheloadcarriedltliereby,

I claim 1. Ina derrick oftlie type having amast mounted for downwardmovement under load; and provided also With means for rais ing said mastwhen free of'load'; a groundengagingfoot for the mast adapted to reststationarily on the ground 'during downward movementof the mast, andco-aoting means embodied with: the foot and mast for turning said mastWith respect to said foot upon said: downward movement of the mast. V

2: A machi'ne as specifiediinlclaim l said co acting means comprising ahelical cam track and a shoe engaging the same.

3. In a derrick of the type having a mast mounted for downward movementunder load, and provided also with means for raismg said mast when freeof load; a groundengaging foot for the mast adapted to rest stationarilyon the ground during downward movement of the mast, said foot having arecess receiving the lower end of the mast, the wall of said recessbeing formed with a helical cam track, and a lateral shoe on said lowerend of the mast engaging said cam track and disposed at the upper endthereof when the mast is free of load.

4. A structure as specified in claim 1; said foot being sufiicientlyheavy to remain stationary on the ground and cause reverse turning ofthe mast under the influence of said coacting means during at least partof the upward movement of said mast.

5. A structure as specified in claim 3; said foot being suflicientlyheavy to remain stationary on the ground and cause reverse turning ofthe mast under the influence of said cam track and shoe during at leastpart of the upward movement of said mast.

6. A structure as specified in claim 1; said mast being jointed adjacentsaid co-acting means to permit said foot to adapt itself to the surfaceof the ground without danger of placing a prying strain on saidco-acting means.

7. In a derrick of the type having a mast mounted for downward movementunder load, and provided also with means for raising said mast when freeof load; a groundengaging foot for the mast adapted to rest stationarilyon the ground durin downward movement of the mast, said foot aving arecess receiving the lower end of the mast, the wall of said recessbeing formed with opposed helical cam tracks, a member movablevertically in said recess and having shoes projecting in oppositedirections an engaging sa d tracks, and a flexible joint connecting saidmember with the lower end of the mast, to permit the aforesaid foot toadapt itself to the surface of the ground without danger of placingprying strain on the aforesaid member.

8. A structure as specified in claim I; together with a brake drumsurrounding said mast and having a driving connection therewith, saiddriving connection permitting sliding of the mast through the drum, anda brake co-operable with said drum, provision being made for holdingsaid drum against vertical movement.

9. In a derrick of the type having a mast mounted for downward movementunder load, and provided also with means for raising said mast when freeof load; a brake drum surrounding said mast and hav ng a drivingconnection therewith, said driving connection permitting sliding of themast through the drum, and a brake co-operable with said drum, provisionbeing made for holding said drum against vertical movement.

10. In a derrick of the type having a mast mounted for downward movementunder load, and provided also with means for swinging the mast totransfer the load from one place to another cooperative with the groundon said downward movement of the mast, a brake drum associated with thederrick mast for controlling the swinging and movement of the same andbrake means cooperating with said drum substantially as set forth.

11. In a derrick of the type having a mast mounted for downward movementunder load, means associated with the derrick for automatically swingingthe same incident to its vertical movement, brake drum means connectedwith the mast for controlling its swinging movement and including abrake band acting on the brake drum substantially as described.

In testimony whereof I have hereunto affixe'd my signature.

ARVEY SMITH.

